Posted 27 November 2012 - 02:16 PM

Gringo Vermelho is correct, you can adjust to match your native resolution; however, you will not be able to obtain hardware acceleration. This is a prerequisite of many applications.

The graphics card you purchased is not supported on 10.5; however, as JavaKrypt said, it is supported under 10.7 Lion. If I am not mistaken, it may also be supported under 10.6 Snow Leopard.

Please provide us with some specifications about your system (CPU, Motherboard, Graphics & Model Number if applicable). Adding more specific information allows us to respond quickly with more precise answers. Chipset, LAN, Audio & If your Graphics are integrated or not, are excellent additions.